Package org.apache.velocity.context

Class InternalContextAdapterImpl

  • All Implemented Interfaces:
    Context, InternalContextAdapter, InternalEventContext, InternalHousekeepingContext, InternalWrapperContext
    public final class InternalContextAdapterImpl
extends java.lang.Object
implements InternalContextAdapter
    This adapter class is the container for all context types for internal use. The AST now uses this class rather than the app-level Context interface to allow flexibility in the future. Currently, we have two context interfaces which must be supported :
    • Context : used for application/template data access
    • InternalHousekeepingContext : used for internal housekeeping and caching
    • InternalWrapperContext : used for getting root cache context and other such.
    • InternalEventContext : for event handling.
    This class implements the two interfaces to ensure that all methods are supported. When adding to the interfaces, or adding more context functionality, the interface is the primary definition, so alter that first and then all classes as necessary. As of this writing, this would be the only class affected by changes to InternalContext This class ensures that an InternalContextBase is available for internal use. If an application constructs their own Context-implementing object w/o subclassing AbstractContext, it may be that support for InternalContext is not available. Therefore, InternalContextAdapter will create an InternalContextBase if necessary for this support. Note that if this is necessary, internal information such as node-cache data will be lost from use to use of the context. This may or may not be important, depending upon application.
    Version:
    $Id: InternalContextAdapterImpl.java 731266 2009-01-04 15:11:20Z byron $